package com.zdy.viewpager;

import java.util.HashMap;
import java.util.List;

import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class ExpandableListAdapter extends BaseExpandableListAdapter {

  private Context _context;
  private List<String> _listDataHeader; // header titles
  // child data in format of header title, child title
  private HashMap<String, List<String>> _listDataChild;

  public ExpandableListAdapter(Context context, List<String> listDataHeader, HashMap<String, List<String>> listChildData) {
    this._context = context;
    this._listDataHeader = listDataHeader;
    this._listDataChild = listChildData;
  }

  public void setData(List<String> listDataHeader, HashMap<String, List<String>> listChildData) {
    this._listDataHeader = listDataHeader;
    this._listDataChild = listChildData;
    notifyDataSetChanged();
  }

  @Override
  public Object getChild(int groupPosition, int childPosititon) {
    return this._listDataChild.get(this._listDataHeader.get(groupPosition)).get(childPosititon);
  }

  @Override
  public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
  }

  @Override
  public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView,
      ViewGroup parent) {

    final String childText = (String) getChild(groupPosition, childPosition);

    if (convertView == null) {
      LayoutInflater infalInflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      convertView = infalInflater.inflate(R.layout.list_item, null);
    }

    TextView txtListChild = (TextView) convertView.findViewById(R.id.lblListItem);

    txtListChild.setText(childText);
    return convertView;
  }

  @Override
  public int getChildrenCount(int groupPosition) {
    if(this._listDataChild.get(this._listDataHeader.get(groupPosition))==null)
      return 0;
    return this._listDataChild.get(this._listDataHeader.get(groupPosition)).size();
  }

  @Override
  public Object getGroup(int groupPosition) {
    return this._listDataHeader.get(groupPosition);
  }

  @Override
  public int getGroupCount() {
    return this._listDataHeader.size();
  }

  @Override
  public long getGroupId(int groupPosition) {
    return groupPosition;
  }

  @Override
  public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    String headerTitle = (String) getGroup(groupPosition);
    if (convertView == null) {
      LayoutInflater infalInflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      convertView = infalInflater.inflate(R.layout.list_group, null);
    }

    TextView lblListHeader = (TextView) convertView.findViewById(R.id.lblListHeader);
    lblListHeader.setTypeface(null, Typeface.BOLD);
    lblListHeader.setText(headerTitle);

    return convertView;
  }

  @Override
  public boolean hasStableIds() {
    return false;
  }

  @Override
  public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
  }
}
